/* 删除浏览器自带蓝框 */
div {
    outline:none;
}

/* 线条 */
#line1 {border-top: 1px solid red;}

#line2 {border-top: 1px solid red; transform: scaleY(0.5); }

/* 边框的样式 凸起按钮 */
a:link img {border-style: outset;}

/* 定义多种样式 实线上边框、点线右边框、虚线下边框和一个双线左边框 */
p.aside {border-style: solid dotted dashed double;}

p {border-style: solid solid solid none;}
p {border-style: solid; border-left-style: none;}

/* 边框的颜色 */
p {
  border-style: solid;
  border-color: blue rgb(25%,35%,45%) #909090 red;
}
p {
  border-style: solid;
  border-color: blue red;
}

/* 定义单边颜色 */
h1 {
  border-style: solid;
  border-color: black;
  border-right-color: red;
}

/* 透明边框 */
a:link, a:visited {
  border-style: solid;
  border-width: 5px;
  border-color: transparent;
  }
a:hover {border-color: gray;}
